Interesting what young people nowadays use a cellphone for: “Until recently, cellphone novels — composed on phone keypads by young women wielding dexterous thumbs and read by fans on their tiny screens — had been dismissed in Japan as a subgenre unworthy of the country that gave the world its first novel, ‘The Tale of Genji,’ a millennium ago. Then last month, the year-end best-seller tally showed that cellphone novels, republished in book form, have not only infiltrated the mainstream but have come to dominate it.”